Attain Medical Instrument Calibration With 1-Wire NV Memory


A new specifically designed gamma resistant non-volatile memory based on 1-wire technology is launched that allows calibrating of consumable medical sensors, tools and accessories to their host medical instrument in the field.

The basis of 1-Wire technology is a serial protocol using a single data line plus ground reference for communication. 1-Wire is the only voltage-based digital system that works with two contacts, data and ground, for half-duplex bidirectional communication. In contrast to other serial communication systems such as I²C or SPI, 1-Wire devices are designed for use in a contact environment. Either disconnecting from the 1-Wire bus or a loss of contact puts the 1-Wire slaves into a defined reset state. When the voltage returns, the slaves wake up and signal their presence. With only one contact to protect, the built-in ESD protection of 1-Wire devices is extremely high. With two contacts, 1-Wire devices are the most economical way to add electronic functionality to non-electronic objects for identification, authentication, and delivery of calibration data or manufacturing information.

Maxim Gamma Radiation 01


According to Maxim press release, since gamma radiation is incompatible with traditional floating-gate memory technologies used in semiconductors as its high-ionising radiation erases the memory the all new DS28E80, NV memory offers resistance to gamma radiation up to 75kGy (kilo gray) with flexible programming options. The product datasheet mentions, “The NV memory has 248 bytes of user memory that are organized in blocks of 8bytes. Individual blocks can be write-protected. Each memory block can be written eight times. The DS28E80 communicates over the single-contact 1-Wire bus at standard speed or overdrive speed. Each device has its own guaranteed unique 64-bit registration number that is factory programmed into the chip.”

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“We know that gamma radiation has historically been incompatible with NV memory technologies, but for some single-use medical applications gamma radiation may be the preferred method for sterilisation. So we designed an NV memory that resists the radiation, connects to a host medical device simply, and then reliably monitors or prevents reuse of the consumable. It’s all as simple as its 1-Wire interface,” said Nathan Sharp, Business Manager at Maxim Integrated.

Key advantages offered by 1 wire gamma resistant DS28E80 NV memory as listed below:

  • Manufacturing calibration: OEMs can automatically detect and calibrate sensors and accessories to ensure quality
  • Usage tracking: Guards against incorrect attachment and warns or prevents unsanitary reuse of consumables
  • Embedded identification: Embedded 1-Wire protocol provides unalterable 64-bit factory-assigned serial ID which allows for tracking and can prevent usage of unauthorised consumables
  • Re-programmable: 248 bytes of user memory organized in 8-byte blocks
  • Permanent write protection: Flexible per-block options for use memory
  • Temperature range: Is specified over the -40-degree Celsius to +85-degree Celsius


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